# Illustration Voltage-Time Graph: Discharging a Capacitor

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When the capacitor with capacitance $$C$$ is discharged through a resistor $$R$$, starting at the initial voltage $$U_0$$, the voltage $$U_{\text C}(t)$$ across the capacitor follows the an exponential curve:$U_{\text C}(t) = U_0 \, e^{-\frac{t}{R\,C}}$

As $$t$$ approaches infinity (after waiting for a long time), the voltage $$U_{\text C}(t)$$ approaches zero.